fix(ui): disable broken tabs + add @spaces.GPU + MiniCPM trust_remote_code note

fix(spaces): bind app to port 7860 and disable SSR to fix HF launch timeout

sec: remove API key from Gradio frontend value — SEC-1 critical fix

feat(nemotron-space): companion Space branch for HearthNet-Nemotron

feat(rag): docs ingestion + UI/bus enhancements (P3 continuation)

feat: Nemotron Space, Modal backend, sponsor prize targeting, improvements doc